My evaluation process for home espresso machines is very similar to how I test standard drip coffee makers. I start by hand-washing and drying all removable parts and accessories before running a brewing cycle with just hot water to flush away any residual manufacturing materials. Since most automatic espresso machines do not have integrated coffee grinders, I prefer to use freshly ground coffee for testing, so I supply my own conical burr grinder, the Breville Smart Grinder Pro. This grinder produces a fine and consistent grind, which is essential for the proper espresso brewing process.
When pulling shots, I follow the suggested method outlined in the machine’s product manual, including the amount of coffee grounds per shot and tamping instructions if provided. I always brew double shots of espresso to record the weight of the grounds used and the weight of espresso for each shot. Using a portable refractometer, I calculate important percentages such as total dissolved solids and extraction percentage. The ideal extraction percentage for espresso falls within a range of 18% to 22%, ensuring a balanced cup with efficient extraction of coffee compounds.
Testing the Breville Barista Express, I found that it could produce quality shots with a balanced extraction of 18.6%. Using Costco Kirkland Colombian coffee beans, a medium-dark roast suitable for espresso, helped achieve this result. Additionally, many espresso machines come with steaming wands for frothing milk. The Breville Bambino, for example, made steaming milk easy, allowing for the creation of cafe-style espresso drinks like lattes and cappuccinos. I also evaluated the overall experience with the steam wand, noting whether the process was seamless or more challenging.
Over-extraction in espresso brewing can lead to the leaching of unpleasant flavors, while under-extracted brews often lack developed flavors, resulting in a sour and weak taste. Unlike drip coffee, barista-quality espresso should be concentrated, with a much higher total dissolved solids percentage. The Breville Barista Express, for instance, produced shots with TDS percentages as high as 12.4%. By carefully controlling the extraction process, one can achieve a properly balanced and flavorful cup of espresso that meets the desired standards for quality and taste.
In conclusion, the evaluation process for home espresso machines involves thorough testing of various aspects such as equipment cleanliness, coffee grinding, shot pulling, and milk frothing. By following specific guidelines for extraction percentages and using quality coffee beans, one can ensure the production of balanced and flavorful espresso shots. Additionally, steaming milk with the included steam wand allows for the creation of delicious espresso-based drinks like lattes and cappuccinos. Overall, the evaluation process helps determine the capabilities and performance of the espresso machine in delivering high-quality espresso beverages for home brewing enthusiasts.
